Flexible printed board

Abstract

A base layer of a bent portion of a FPC is formed on the front side thereof with second ground bent lines arranged in a mesh pattern and third ground bent lines intersecting with the second ground bent lines in a lateral direction, and on the back side thereof with first ground bent lines along the bending direction. The first ground bent lines are electrically connected to the second ground bent lines and the third ground bent lines via through holes.

1. A flexible printed board having two planar portions and a bent portion being positioned therebetween comprising:
 a plurality of first signal lines that is formed on one surface of a base layer of the bent portion and connects the signal lines on the two planar portions; 
 a plurality of first ground lines that is formed on the one surface of the base layer of the bent portion and connects the ground lines on the two planar portions; 
 a plurality of second ground lines that is formed on the other surface of the base layer of the bent portion and connects the ground lines on the two planar portions in a diagonal mesh pattern; 
 a plurality of third ground lines that connects the plurality of second ground lines and is formed in a direction orthogonal to a bending direction of the bent portion; and 
 through holes that connect the first ground lines on the one surface of the bent portion to the second ground lines or the third ground lines on the other surface of the bent portion; 
 wherein the first signal lines and the first ground lines are formed in parallel to the bending direction of the bent portion. 
 
     
     
       2. The flexible printed board according to  claim 1 , further comprising a cover layer that covers the one surface of the bent portion at a portion other than the second ground lines and the third ground lines. 
     
     
       3. The flexible printed board according to  claim 1 , wherein the flexible printed board connects a liquid crystal cell and a printed wiring assembly as a driver.